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// Copyright (c) 2010 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "skia/ext/bitmap_platform_device.h"
#include "skia/ext/bitmap_platform_device_data.h"
#include "third_party/skia/include/core/SkUtils.h"
namespace {
// Constrains position and size to fit within available_size. If |size| is -1,
// all the available_size is used. Returns false if the position is out of
// available_size.
bool Constrain(int available_size, int* position, int *size) {
if (*size < -2)
return false;
if (*position < 0) {
if (*size != -1)
*size += *position;
*position = 0;
}
if (*size == 0 || *position >= available_size)
return false;
if (*size > 0) {
int overflow = (*position + *size) - available_size;
if (overflow > 0) {
*size -= overflow;
}
} else {
// Fill up available size.
*size = available_size - *position;
}
return true;
}
} // namespace
namespace skia {
void BitmapPlatformDevice::makeOpaque(int x, int y, int width, int height) {
const SkBitmap& bitmap = accessBitmap(true);
SkASSERT(bitmap.config() == SkBitmap::kARGB_8888_Config);
// FIXME(brettw): This is kind of lame, we shouldn't be dealing with
// transforms at this level. Probably there should be a PlatformCanvas
// function that does the transform (using the actual transform not just the
// translation) and calls us with the transformed rect.
const SkMatrix& matrix = data_->transform();
int bitmap_start_x = SkScalarRound(matrix.getTranslateX()) + x;
int bitmap_start_y = SkScalarRound(matrix.getTranslateY()) + y;
if (Constrain(bitmap.width(), &bitmap_start_x, &width) &&
Constrain(bitmap.height(), &bitmap_start_y, &height)) {
SkAutoLockPixels lock(bitmap);
SkASSERT(bitmap.rowBytes() % sizeof(uint32_t) == 0u);
size_t row_words = bitmap.rowBytes() / sizeof(uint32_t);
// Set data to the first pixel to be modified.
uint32_t* data = bitmap.getAddr32(0, 0) + (bitmap_start_y * row_words) +
bitmap_start_x;
for (int i = 0; i < height; i++) {
for (int j = 0; j < width; j++)
data[j] |= (0xFF << SK_A32_SHIFT);
data += row_words;
}
}
}
}
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